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A081598 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
107
118
129
1310
1411
1512
1613
1714
1815
1916
2014
2115
2216
2317
2418
2519
2620
2721
2822
2923
3021
3122
3223
3324
3425
3526
3627
3728
3829
3930
4028
4129
4230
4331
4432
4533
4634
4735
4836
4937
5035
5136
5237
5338
5439
5540
5641
5742
5843
5944
6042
6143
6244
6345
6446
6547
6648
6749
6850
6951
7049
7150
7251
7352
7453
7554

[0,1,2,3,4,5,6,7,8,9,7,8,9,10,11,12,13,14,15,16,
 14,15,16,17,18,19,20,21,22,23,21,22,23,24,25,26,
 27,28,29,30,28,29,30,31,32,33,34,35,36,37,35,36,
 37,38,39,40,41,42,43,44,42,43,44,45,46,47,48,49,
 50,51,49,50,51,52,53,54]